Revving up fluorescence for superfast LEDs
Revving up fluorescence for superfast LEDs
Duke
University researchers have made fluorescent molecules emit photons of
light 1,000 times faster than normal -- setting a speed record and
making an important step toward realizing superfast light emitting
diodes (LEDs) and quantum cryptography.
This year's Nobel Prize in physics was awarded for the discovery of
how to make blue LEDs, allowing everything from more efficient light
bulbs to video screens. While the discovery has had an enormous impact
on lighting and displays, the slow speed with which LEDs can be turned
on and off has limited their use as a light source in light-based
telecommunications.In an LED, atoms can be forced to emit roughly 10 million photons in the blink of an eye. Modern telecommunications systems, however, operate nearly a thousand times faster. To make future light-based communications using LEDs practical, researchers must get photon-emitting materials up to speed.
In a new study, engineers from Duke increased the photon emission rate of fluorescent molecules to record levels by sandwiching them between metal nanocubes and a gold film.
The results appear online October 12 in Nature Photonics.
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